Development of advanced heat removal technology and experimental investigation of the cooling limit. Challenges by porous media, mist cooling, and high-speed swirling flow. JAERI's Nuclear Research Promotion Program, H11-037. Contract research

Around core plasma of nuclear fusion reactor, there are high heat flux components such as divertor and first wall, and they are required to underbear severe heat loads in the long term. What becomes the problem in this condition is an upper limit of steady heat removal, namely critical heat flux. By R and D of conventional high heat loading equipments, the critical heat flux increases up to around 50MW/m2. However, the improvement of critical heat flux is required as the result from the compactification of the future reactor. In this study, the limit of latent heat transport which is basic principle of heat and mass exchange is verified by using some special heat removal techniques that authors have proposed so far or innovative heat removal method combined them, in order to achieve the steady heat removal of 100MW/m2 first and the instantaneous heat removal of 250MW/m2. Proposing heat removal methods are (1) cooling with porous materials, (2) local heat removal by mist cooling, and (3) cooling by high-speed swirling flow. The cooling technology over 100MW/m2 is attempted by developing each fundamental thermofluid characteristics and/or combining each advantage. (author)